Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a044de93bef0034…

MALICIOUS

PDF

84.1 KB Created: 2021-04-18 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 838a7c75a448d87391177f6f098e07c1 SHA-1: 8822d1ce12c834194781201ce5cb1dd5b9473a49 SHA-256: 1a044de93bef0034c62aad104156fa116f538c09a3b25327933d83f583ffe006
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains obfuscated text that appears to be a lure related to 'Oracle sql date format remove time', directing users to a suspicious URL. The presence of a large number of external links, many pointing to PDFs, suggests a link farm or SEO poisoning tactic. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=oracle+sql+date+format+remove+time PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/jee_main_rank_2016_result.pdfIn PDF document text
    • http://magobugibex.epizy.com/batch_production_management.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/vebovegubosojo.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_fe4e97b7833f422eb259f93d0ad32aac.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_8398645512b64f418e4276671a60a868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c48e62c-1d4f-4d86-8cc8-393b006ede7b/zuzivowig.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/zuvimilarile.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/66126422508.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_56f5484f8c9a4948b6685d2ee13c3514.pdf?index=trueIn PDF document text
    • http://palezepebarinot.rf.gd/sopirojudu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/mopexabufilomagavawa.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/76631533696.pdfIn PDF document text
    • http://bewalixatama.epizy.com/britannia_balance_sheet_2020.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e283ad0ff6bf44abaf3fefd3eb68e801.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_14d84022f69f4361b9f7857d73a29475.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8209325a-2270-4616-b616-b5d4598f4602/meaning_of_communication_skills_and_its_importance.pdfIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_aa5d1c4cd4c7499caf6a8adcf186c9f3.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_35d258710ac949fbb32c8fd1b4a303ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/nba_2k18_vc_generator.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_ceb72f7237cd4c7d996ac9835de3c375.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_35748318fe2b468ea3073b4de3126cbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/complete_english_dictionary_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 5380 bytes
SHA-256: 4fa2c12201ae5f55b51731c79635ad869ae0c27e23ca0e2e783171473d4c8449
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 11340 bytes
SHA-256: f590a34eb26d9a8d5b58b0542535fe9fd339516d4946f6d302cae3b4996c85ca

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